Would faulty BCM causing PCM not detected

[auspeed]

I can read the PCM fine on the bench harness, & the vats is/was disabled in the tune. The car (holden vy clubsport) fires then dies as like it needs a VATS relearn done. However
when connected in the car efi live can't detect the pcm, can't read/write or change vin etc......

Suspected the BCM maybe faulty but would that cause the pcm comms to be affected?

[slows10]

Start pullin fuses and try to flash until you pick the right fuse. Then it will probably detect and flash your ecm.

[GMPX]

On the LS1 Holdens there was no other modules on the PCM's comms bus so it's pretty clean (unlike many US vehicles). I doubt the PCM is faulty, I suspect it's be some silly alarm system that cuts power to the PCM.

[auspeed]

Well the car starts then stalls, and can't connect to PCM, I suspect its the BCM module.